diff --git a/.github/workflows/cron-update-kg-proxy.yml b/.github/workflows/cron-update-kg-proxy.yml
new file mode 100644
index 000000000..7c70aaec1
--- /dev/null
+++ b/.github/workflows/cron-update-kg-proxy.yml
@@ -0,0 +1,73 @@
+name: '[cron] update KG proxy'
+
+on:
+  schedule:
+    - cron: '5 4 * * 0' # every Sunday at 4am
+
+env:
+  EBRAINS_CCFLOW_CLIENT_ID: ${{ secrets.EBRAINS_OIDC_SIIBRA_CI_CLIENT_ID }}
+  EBRAINS_CCFLOW_CLIENT_SECRET: ${{ secrets.EBRAINS_OIDC_SIIBRA_CI_CLIENT_SECRET }}
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - artefacts-dir: "ebrainsquery/v3/AtlasAnnotation"
+          query-id: "66c69c41-ad91-4915-ac23-897fd0c60211"
+
+        - artefacts-dir: "ebrainsquery/v3/ParcellationEntity"
+          query-id: "d236e213-c048-4331-bfd9-b45c60bc3d03"
+          
+        - artefacts-dir: "ebrainsquery/v3/ParcellationEntityVersion"
+          query-id: "5e80bb84-68cf-4425-859b-5306f6838693"
+
+        - artefacts-dir: "ebrainsquery/v3/CustomAnatomicalEntity"
+          query-id: "d7cdc1d6-0aa5-498a-94ff-0291b95db13d"
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v4
+      with:
+        python-version: '3.10'
+    - name: 'Install dependencies'
+      run: |
+        pip install ebrains-drive
+        pip install git+https://github.com/xgui3783/ebrains-iam-util.git
+    - name: 'Fetch and Sync to KG proxy'
+      run: |
+        export EBRAINS_QUERY_ID=${{ matrix.query-id }}
+        export EBRAINS_ARTEFACTS_DIR=${{ matrix.artefacts-dir }}
+        export EBRAINS_CCFLOW_CLIENT_ID=${{ env.EBRAINS_CCFLOW_CLIENT_ID }}
+        export EBRAINS_CCFLOW_CLIENT_SECRET=${{ env.EBRAINS_CCFLOW_CLIENT_SECRET }}
+
+        python _ci/cron_sync_kg_proxy.py
+  
+  latest-siibra-release:
+    runs-on: ubuntu-latest
+    outputs:
+      LATEST_TAG: ${{ steps.get-latest-tag.outputs.LATEST_TAG }}
+    steps:
+    - id: get-latest-tag
+      run: |
+        LATEST_TAG=$(gh release -R fzj-inm1-bda/siibra-python ls --jq '.[0].tagName' --json 'tagName')
+        echo LATEST_TAG=$LATEST_TAG
+        echo "LATEST_TAG=$LATEST_TAG" >> $GITHUB_OUTPUT
+
+  check-region-e2e:
+    runs-on: ubuntu-latest
+    needs:
+    - update
+    - latest-siibra-release
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        repository: 'fzj-inm1-bda/siibra-python'
+        ref: ${{ needs.latest-siibra-release.outputs.LATEST_TAG }}
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.10'
+    - run: pip install -U pip && pip install -e . && pip install pytest
+    - run: pytest e2e/core/test_region.py
+
diff --git a/_ci/cron_sync_kg_proxy.py b/_ci/cron_sync_kg_proxy.py
new file mode 100644
index 000000000..82740ec30
--- /dev/null
+++ b/_ci/cron_sync_kg_proxy.py
@@ -0,0 +1,97 @@
+import os
+from pathlib import Path
+from concurrent.futures import ThreadPoolExecutor
+from itertools import repeat
+import json
+from io import StringIO
+
+from tqdm import tqdm
+import requests
+from ebrains_iam.client_credential import ClientCredentialsSession
+from ebrains_drive import BucketApiClient
+
+EBRAINS_CCFLOW_CLIENT_ID = os.getenv("EBRAINS_CCFLOW_CLIENT_ID")
+EBRAINS_CCFLOW_CLIENT_SECRET = os.getenv("EBRAINS_CCFLOW_CLIENT_SECRET")
+
+EBRAINS_QUERY_ID = os.getenv("EBRAINS_QUERY_ID")
+EBRAINS_ARTEFACTS_DIR = os.getenv("EBRAINS_ARTEFACTS_DIR")
+
+KG_ROOT = os.getenv("KG_ROOT", "https://core.kg.ebrains.eu")
+
+def get_paginated(url: str, size: int, from_: int, token: str):
+    resp = requests.get(url,
+                        params={"stage": "RELEASED", "size": str(size), "from": str(from_)},
+                        headers={ "Authorization": f"Bearer {token}" })
+    resp.raise_for_status()
+    return resp.json()
+
+def write_to_file(path: str, data):
+    with open(path, "w") as fp:
+        json.dump(data, indent="\t", fp=fp)
+        fp.write("\n")
+
+def main():
+    assert EBRAINS_CCFLOW_CLIENT_ID, f"EBRAINS_CCFLOW_CLIENT_ID must be defined"
+    assert EBRAINS_CCFLOW_CLIENT_SECRET, f"EBRAINS_CCFLOW_CLIENT_SECRET must be defined"
+    assert EBRAINS_QUERY_ID, f"EBRAINS_QUERY_ID must be defined"
+    assert EBRAINS_ARTEFACTS_DIR, f"EBRAINS_ARTEFACTS_DIR must be defined!"
+
+    iamclient = ClientCredentialsSession(EBRAINS_CCFLOW_CLIENT_ID, EBRAINS_CCFLOW_CLIENT_SECRET, scope=["team"])
+    
+    path = Path(EBRAINS_ARTEFACTS_DIR)
+    path.mkdir(parents=True, exist_ok=True)
+
+    token = iamclient.get_token()
+
+    url=f"{KG_ROOT}/v3/queries/{EBRAINS_QUERY_ID}/instances"
+    resp = get_paginated(url, 50, 0, token=token)
+
+    total = resp.get("total")
+
+    print(f"Getting {total=} instances, paginated by 50...")
+
+    with ThreadPoolExecutor(max_workers=6) as ex:
+        remaining_results = list(ex.map(
+            get_paginated,
+            repeat(url),
+            repeat(50),
+            range(50, total, 50),
+            repeat(token)
+        ))
+    
+    print("Uploading files ...")
+    
+    bucketclient = BucketApiClient(token=token)
+    bucket = bucketclient.buckets.get_bucket("reference-atlas-data")
+    
+    all_atlas_annotations = [datum for r in [resp, *remaining_results] for datum in r.get("data")]
+
+    progress = tqdm(total=len(all_atlas_annotations), desc="Uploading", unit="Files")
+
+    for datum in all_atlas_annotations:
+        io = StringIO(json.dumps(datum, indent="\t"))
+        io.seek(0)
+        _id = datum.get("id").split("/")[-1]
+
+        retry_counter = 0
+        while True:
+            try:
+                bucket.upload(io, f"{EBRAINS_ARTEFACTS_DIR}/{_id}.json")
+                progress.update()
+                break
+            except Exception as e:
+                print(f"Error: {str(e)}")
+                if retry_counter >= 5:
+                    print(f"Retry max hit, terminating")
+                    raise e from e
+                retry_counter += 1
+                print("Retrying ...")
+
+                token = iamclient.get_token()
+                bucketclient = BucketApiClient(token=token)
+                bucket = bucketclient.buckets.get_bucket("reference-atlas-data")
+
+
+if __name__ == "__main__":
+    main()
+